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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd9e8dacef846130f809c2d52f510de091dc6902ef4737fd5ef7fb6b13af57f' 
  AND token = 'ZqB/fqtdvm5gXwgb2Z411xrUW0hyeWpZ0YHgzW7ffvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}